Introduce LibraryInstallationGoalState #743
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The existing LibraryInstallationState abstraction is not flexible about mapping files to their source on an individual basis. It presumes that all files installed by a library retain the same folder hierarchy as the library they originate from. In order to allow more flexibility, this change adds a new abstraction to wrap all installed files to their individual source files. This eliminates the prior assumption, allowing for flexibility to install files to a different folder hierarchy than their originating library structure. This flexibility also allows an important new concept: each destination file must be unique (to avoid collisions), but the sources are not so constrained. A single source file may be installed to multiple destinations; by creating a mapping of destination-to-source, we can easily allow this. This change prepares for a new feature to allow more granular mappings of files within a library.
Also updated Manifest to use the goal state for the uninstall scenario.
Needed so that FileSystemProvider can override the default behavior, since it doesn't use the same cache logic as other providers.
phil-allen-msft
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May 20, 2024
| /// <summary> | ||
| /// Returns whether the goal is in an achieved state - that is, all files are up to date. | ||
| /// </summary> | ||
| public bool IsAchieved() |
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I like the name "achieved" as a word to match "goal", but it seems like if http URLs can never be achieved, maybe the method name could be "IsLocallyAcheived" as opposed to an IsAchievedAsync(cancellationtoken) that would actually make network calls to try and verify. Thoughts?
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This change refactors how we track the state of which files get installed from each library. The LibraryInstallationGoalState is a mapping of destination files to their sources (where the source is from the local file cache if applicable).
In a manner of speaking, if LibraryInstallationState ("LIS") is the input ("I want these files from this library from that provider"), then LibraryInstallationGoalState ("LIGS") is a computed output of exactly what work needs to be performed ("These files are copied to those destinations").
This design offers some additional flexibility.